Means for the manufacture, centrifugally, of pipes, columns, and other hollow articles



April 27 1926. 1582,586

K. DUNDAS MEANs FOR THE MANUFACTURE, CENTRIFUGALLY, oF PIPEs,

coLUMNs, AND oTHER HoLLow ARTIcLEs Filed Oct. 1., 1924 2 Sheets-Sheex*l 2 Patentecl Apr. 27, 1926.

UNITED ;STATES PATENT OFFICE.

.KENNETH DUNDAS, OF GLASGOW, SCOTLAND.

MEANS FOR THE MANUFACTURE, CENTRIFUGALLY, OF PIPES, CLUMNS, AND OTHE HOLLOW ARTICLES. i

Application filed October 1924. Serial No. 741,694.

T0 all whom t mayconccm:

Beit known that I, KENNETH DUNDAS, a subject of the' King of Great Britain and Ireland, rcsiding at Glasgow, Scotland, have invented Improvements in or Relating .to Means for the Manufacture, Centrifugally, of Pipes, Columns, and Other Hollow Articles, of which the following is a specification.

This invention relates to means for manufacturing hollow articles centrifugally by distributing evenly in al rotating mould, pipe or other member, plastic materials from a longitudinally movable trough, and it has for its object to provide plant of a simple Character in which the drive of a mould or article to be lined is eflcc-ted by means of rings removably secured to the exterior of the moul'd or article, each of the said rings being either toothed and shrouded or formed with V grooves and being in engagement with two complementary toothed or V groovcd supporting Wheels, an additional pair of wheels mounted in holders capable of horizontal adjustment being provided to resist upward movement of the -mould or article.

In this way not only is there practically no tendency to slip in driving, especially at starting, but it is ensured with little extra cost, as the relatively expensive toothed or grooved-rings may be removed from any one mould or article dealt with and applied to another of the same type or even to others of different dimensi'ons so long as care is taken to make the seating for the rings of one size. Similarly in the case of moulds, if the seatings for the rings be properly chosen of a diameter to correspond to the outside diameter of a pipe, such rings may be used alternatively for various sizes of moulds or pipes.

To enable moulds or pipes which may have to be equipped with rings of different diameters, to be dealt with by one and the same plant with as little adjustment as possible, the moulds or pipes can be supported With but slight or no displacement of the axis of rotation which is desirable in view of the supports for the tro-ugh introduced'into the mould, this being obtained by employing lower toothed or V grooved supporting Wheels of different diameters and interchanging one set for another, which can be effected in any suitable Way.

The trough for introducng' material into the mould orl pipe is rotata-ble about an axis that is fixed but eccentric in relation to the axis of rotation of the -mould or pipe; and where, by l;reason of size, the operation of hand rotating the trough may become' inconvenient. mechanical means are provided of a self holding Character which can be used to subsequently position the scraper if such be employed to dress the-interior of the rotating mass.

In the accompanying drawings, Fig. 1 is a longitudinal section of one embodilnent of the invention, Fig. 2 being a transverse section on the line 2-2 of Fig. 1. Fig. 3 is a view representing in one plane Sections corresponding to the line 3-3 Fig'. 2 but illustrating a modification. Figs. 4, 5 and 6 are views of three detail modifications.

Referring first to Figs. 1 and 2, two mould parts 1, 2 are shown as provided with flang'es 01' ribs 3 by which they can be readily bolted together, 4 being end formers placed in position before assembling the mould parts. 4- are portions of the mould constituting' shouldered seatings for rings 5 the teeth 6 whereof are shrouded as at 7 the shr-oudings coinciding; with the pitch circle of the teeth. These rings may be a relatively easy fit upon the seatings but held firmly in any suitable manner such as by means of one or more keys 8 that need not be completely remored but may be merely driven partly out after slackening a nut 9 thereon. i

Such a mould, or a'pipe to which the ring's 5 or their equivalent may be applied, is supported from a pair of pcdestal fra'mes 10 by a system of four Wheels associated with each frame, two of which Wheels 11, are mounted upon shafts 12. These Wheels 11 are preferably of the section shown in Fig. 1 (where one of the Wheels is illustrated not vin its proper position) that is to say with plain peripheral surfaces flanking the teeth in order to offer a bearing to the shrouding 7 of the rings 5. Either shaft 12 may be driven and the drive may be transmitted therefrom by either or both of the Wheels. 11 on such shaft. 13 are Wheels intended to bear upon the rings 5 in such a way as to prevent the mould or pipe rising whilst rotating, such Wheels being mounted in holders 14 capable of being 'adjusted along slides 15 under the control of screws 16.'

The manner in which the shafts 12 may be supported will be more readily understood from. Fig. 3 in conjunction with Fig.

2, 17 being lined bushes adapted to be seeured by screws to the frames 10. In Fig. 3 each ringI 5a is of the section shown, that is to say having four annnlar wedge-like teeth received by complementary O'rooves in supporting wheels 11. This is onzly one example which is convenient bnt others may be employed as will be self evident from Figsi 4, 5 and 6 which illustrate a ring 5b, 5 and 5d having respectively three teeth, two teeth and one tooth.

In all these instances it will be apparent that the tendency of slip to occnr between the rings and supporting rollers is effectively overcome and that endwise movement of the parts is prevented.

The trongh 18, which is conveniently a cylinder' with a longitndinal gap is connected at one end to a plate 19 havingl a bearing pin 20 adapted to enter' a pedest-al 21 the axis of rotation of the trongh being situated at 22 Fig. 2 below and to one side of the axis of rotation of the monld which is indicated at 23. After the trongh has been advanced into the monld, or pipe, so that it is supported at one end by the pedestal 21, the shaft- 21 to which the other end of the trongh is connected and which is mounted in the carriage 25 employed to ad- Vanee and withdraw the trongh, can be rotated to empty the trongh of its contents by turning the worm 26 which engages the worm wheel 27 keyed to the shaft 2. This worm and wheel constitnte an Operating gear of a self holding character. For the smaller diameters and sizes the trongh may be rotated by a hand lever fixed to shaft 24.

By reversing the direction of rotation of the shaft 2, after emptying the trongh, the blade 28 upon the latter can be held by the gearing referred to or by the hand lever referred to, at the proper cntting or dressing distance from the monld or pipe.

The monlds are shown in the example as supported by two frarnes and rings which being located intermediate of the length of the mould or article thereby give an overhang at the ends which can be caused to more or less counteract the tendency to sag at the centre, but obviously they7 may be otherwise arranged and increased in number to suit different requirements. In like manner although'the mould is shown as adapted to receive end formers before assembling of the parts en'd formers may be employed that are snbsequently placed in position. The monld parts being illnstrated as bolted together the rings need not be relied upon to hold such parts althongh they may assist in so doing. In addition to the mannfactnre of pipes of cement for which the appara'tus is particnlarly applicable, it will also be found highly advantageous for lining steel, iron or other metal pipes with concrete or cement and for lining pipes in general, i. e., eoncrete or metallic, with bitnminons or other plastic composition.

lVh-at I claim is 2-- 1. Means of the kind herein referred to, comprising a rotary member, a trongh fitted with a scraper adapted to be introdnced longitudinally into such member, a shaft to which the trongh is rigidly connected and bearings for the shaft arranged so that the axis of rotation for the trongh is stationary and situated below and to one side of the axis of rotation of the monld, rotation of the trongh in one direction serving to empty the contents and rotation of the trongh in the reverse direction advancing the scraper towaf'ds the inner wall of the rotary member, snhstantially as described.

2. Means of the kind herein referred to, comprising a rotary member, a trongh fitted with a scraper adapted to be introdnced longitndinally into such member, a shaft to which the trough is rigidly connected and bearings for the shaft arranged so that the axis of rotation for the trongh is stationary and situated below and to one side of the axis of rotation of the monld, rotation of the trough in one direction serving to empty the contents and rotation of the trongh in the reverse direction advancing the seraper towards the inner wall of the rotary member, and means of a self holding character adapted to rotate the trough.

Signed at Glasgow, Scotland this 12th day of September 1924.

KENNETH DUNDAS. 

